1) error 확인

CentOS6버전의 EOL(End of Life)이 2020-11-30로 인해 fastmirror에서 CentOS 6 Package삭제가 되어 발생

2) 해결 방법 (임시)

root@ NS1:[~]: cd /var/cache/yum/x86_64/6/base/

root@ NS1:[/var/cache/yum/x86_64/6/base]: ls

1aa8754bde2f3921d67cca4bb70d9f587fb858a24cc3d1f66d3315292a89fc20-primary.sqlite  packages

cachecookie                                                                      repomd.xml

root@ NS1:[/var/cache/yum/x86_64/6/base]: echo "https://vault.centos.org/6.10/os/x86_64/" > /var/cache/yum/x86_64/6/base/mirrorlist.txt

root@ NS1:[/var/cache/yum/x86_64/6/base]: echo "https://vault.centos.org/6.10/extras/x86_64/" > /var/cache/yum/x86_64/6/extras/mirrorlist.txt

root@ NS1:[/var/cache/yum/x86_64/6/base]: echo "https://vault.centos.org/6.10/updates/x86_64/" > /var/cache/yum/x86_64/6/updates/mirrorlist.txt

3) 임시 해결 후 yum clean all 명령어 입력시 동일현상 재발생

4) 해결 방법 (영구)

root@ NS1:[/var/cache/yum/x86_64/6/base]: sed -i -e "s/^mirrorlist=http:\/\/mirrorlist.centos.org/#mirrorlist=http:\/\/mirrorlist.centos.org/g" /etc/yum.repos.d/CentOS-Base.repo

root@ NS1:[/var/cache/yum/x86_64/6/base]: sed -i -e "s/^#baseurl=http:\/\/mirror.centos.org/baseurl=https:\/\/vault.centos.org/g" /etc/yum.repos.d/CentOS-Base.repo